The Iowa Department of Natural Resources (DNR) is proposing to update “Compliance Sampling Manual” to reflect the new testing methods for fine particulate matter (PM2.5) and to establish alternative testing procedures. This update is part of the DNR’s rulemaking to adopt changes to the federal regulations for Prevention of Significant Deterioration (PSD) into state air quality rules to address the new national ambient air quality standards (NAAQS) for PM2.5. This proposed rulemaking and associated updates to the Compliance Sampling Manual will be presented to the Environmental Protection Commission for information on February 15. The proposed rulemaking and Compliance Sampling Manual can be viewed on the EPC website.
The proposed changes to the manual would allow facilities to use the new PM2.5 testing methods or to alternatively complete one test for particulate matter (PM) using an updated Iowa procedure to demonstrate compliance with multiple limits for PM, particulate matter that is less than equal to 10 micrometers in diameter (PM10), and PM2.5. The Iowa procedure has been used in the past with facilities conducting a PM test to show compliance with both the PM and PM10 limits in a permit. With the EPA amendments, the DNR no longer considers the current Iowa procedure to be equivalent, and the DNR is revising the Compliance Sampling Manual to address this.
The DNR welcomes questions or comments on the draft Compliance Sampling Manual. Please contact Brian Hutchins at 515-281-8448 or Brian.Hutchins@dnr.iowa.gov to do so. The DNR will also provide an opportunity for formal public comments on the proposed revisions to the Compliance Sampling Manual beginning sometime in late March to early April.